The percentage of Segwit transactions has been pretty stable at about 12%, but the block size has increased to 1.14 MB on average, and fees have fallen considerably. Is there something I’m missing?
Transaction fees are percentage in which the total amount involved in the transaction. So if an exchange has a fixed percent of transaction fees, as the price of bitcoin increases the amount of the fees being given also increases, and also same as bitcoin's price decreases. It is safe to say that bitcoin might grow in value and also depreciates, its transaction fee percentage will always be the same.